Job Title: Freelance Senior Fullstack .NET DeveloperLocation: Brussels, Belgium Start Date: ASAPContract Type: FreelanceWork setup: 2 days/week on-site, 3 days remoteAbout the Role:We are seeking a seasoned and solution-oriented Fullstack .NET Developer to support a key client in Brussels. This role is ideal for someone who thrives on modernizing legacy systems and driving scalable transformation. You will be instrumental in translating business requirements into innovative technical solutions, ensuring seamless interaction between new and existing systems. The software you’ll work on is central to the client's ecosystem, enabling interoperability across multiple products.Key Responsibilities:Design and implement scalable, standardized solutions based on new business needsEnsure smooth integration with legacy systems and support gradual migrationCreate and maintain technical documentation and dependency diagramsCollaborate closely with stakeholders to align technical delivery with business goalsQuickly understand complex business logic and technical constraintsContribute to the modernization of core systems impacting the entire product suiteYour Profile:Minimum 5 years of experience with .NET and Microsoft SQL ServerExperience with PowerBuilderStrong ability to produce clear technical documentationExcellent communication and stakeholder management skillsProven ability to translate business needs into sustainable technical solutionsFluent in English; good understanding of French and/or Dutch is a plusNice-to-Have:Experience with Azure DevOpsFamiliarity with Azure CloudExposure to Kubernetes